//
//     Copyright (C) Pixar. All rights reserved.
//
//     This license governs use of the accompanying software. If you
//     use the software, you accept this license. If you do not accept
//     the license, do not use the software.
//
//     1. Definitions
//     The terms "reproduce," "reproduction," "derivative works," and
//     "distribution" have the same meaning here as under U.S.
//     copyright law.  A "contribution" is the original software, or
//     any additions or changes to the software.
//     A "contributor" is any person or entity that distributes its
//     contribution under this license.
//     "Licensed patents" are a contributor's patent claims that read
//     directly on its contribution.
//
//     2. Grant of Rights
//     (A) Copyright Grant- Subject to the terms of this license,
//     including the license conditions and limitations in section 3,
//     each contributor grants you a non-exclusive, worldwide,
//     royalty-free copyright license to reproduce its contribution,
//     prepare derivative works of its contribution, and distribute
//     its contribution or any derivative works that you create.
//     (B) Patent Grant- Subject to the terms of this license,
//     including the license conditions and limitations in section 3,
//     each contributor grants you a non-exclusive, worldwide,
//     royalty-free license under its licensed patents to make, have
//     made, use, sell, offer for sale, import, and/or otherwise
//     dispose of its contribution in the software or derivative works
//     of the contribution in the software.
//
//     3. Conditions and Limitations
//     (A) No Trademark License- This license does not grant you
//     rights to use any contributor's name, logo, or trademarks.
//     (B) If you bring a patent claim against any contributor over
//     patents that you claim are infringed by the software, your
//     patent license from such contributor to the software ends
//     automatically.
//     (C) If you distribute any portion of the software, you must
//     retain all copyright, patent, trademark, and attribution
//     notices that are present in the software.
//     (D) If you distribute any portion of the software in source
//     code form, you may do so only under this license by including a
//     complete copy of this license with your distribution. If you
//     distribute any portion of the software in compiled or object
//     code form, you may only do so under a license that complies
//     with this license.
//     (E) The software is licensed "as-is." You bear the risk of
//     using it. The contributors give no express warranties,
//     guarantees or conditions. You may have additional consumer
//     rights under your local laws which this license cannot change.
//     To the extent permitted under your local laws, the contributors
//     exclude the implied warranties of merchantability, fitness for
//     a particular purpose and non-infringement.
//

#include <fstream>
#include <iostream>
#include <sstream>
#include <string>


std::string stringify( std::string const & line ) {

    bool inconstant=false;

    std::stringstream s;
    for (int i=0; i<(int)line.size(); ++i) {

        // escape double quotes
        if (line[i]=='"') {
            s << '\\' ;
            inconstant = inconstant ? false : true;
        }

        if (line[i]=='\\' and line[i+1]=='\0') {
            s << "\"";
            return s.str();
        }

        // escape backslash
        if (inconstant and line[i]=='\\')
           s << '\\' ;

        s << line[i];
    }

    s << "\\n\"";

    return s.str();
}

int main(int argc, const char **argv) {

    if (argc != 3) {
        std::cerr << "Usage: quoter input-file output-file" << std::endl;
        return 1;
    }

    std::ifstream input;
    input.open(argv[1]);
    if (not input.is_open()) {
        std::cerr << "Can not read from: " << argv[1] << std::endl;
        return 1;
    }

    std::ofstream output;
    output.open(argv[2]);
    if (not output.is_open()) {
        std::cerr << "Can not write to: " << argv[2] << std::endl;
        return 1;
    }

    std::string line;

    while (not input.eof()) {
        std::getline(input, line);
        output << "\"" << stringify(line) << std::endl;
    }

    return 0;
}